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IPv6 Datagram Overview and General Structure (Page 2 of 2) IPv6 General Datagram Structure As I mentioned above, IPv6 datagrams now includes a main header format (which has no official name in the standards, it's just the header) and zero or more extension headers. The overall structure therefore is as shown in Table 67 and Figure 104.
Note that as with IPv4, large payloads may be fragmented prior to encapsulation, to ensure that the total size of the datagram doesn't exceed the maximum size permitted on an underlying network. However, the details of fragmentation in IPv6 are different than in IPv4.
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